Evaluation of vibration mode shape using a mechanoluminescent sensor

Abstract

This study proposes a method to measure vibration mode shape on beam structures by using the elastic mechanoluminescent (EML) material SrAl2O4: Eu2+. The EML phenomenon has attracted interest due to its potential for application to strain distribution, crack visualization, and structural health monitoring. In this Letter, the relationship between the distribution of luminous intensity and the vibration mode shape of beam structures is explored and is found to be quadratic. A comparison between the results of experiments and simulations shows that the proposed method can measure a structure's vibration mode shape. The study also shows that experimental parameters, such as the exposure time of the camera and the amplitude of excitation, do not affect the validity of this method. The robustness and convenience of the proposed method make it a more efficient technique than prevalent electrical or optical vibrational methods of analysis.

Smart Mechanoluminescent Phosphors: A Review of Strontium‐Aluminate‐Based Materials, Properties, and Their Advanced Application Technologies

“…ML materials based on SAOE and SAOED can be used for structural health monitoring on the surfaces of and inside buildings, [ 27 , 112 ] at pipeline welding points [ 113 , 114 ] for high‐pressure vessels, [ 47 ] etc. The basic idea is to coat the structure to be inspected with an ML composite film; then, images captured with a CCD camera can be investigated in a dark room ( Figure 36 a,b ).…”

“…When the drum head is struck, it undulates and emits light with the undulation of the head. Through this light emission via ML, the sound and vibration [ 112 ] can be turned into dynamic light, allowing visual sensing of music by deaf people. It could be implanted into glass for sound field detection and mapping.…”